From latimes.com: As part of an anti-terrorism effort, the Los Angeles Police Department is now equipping a helicopter and officers on the ground with devices capable of detecting potential radiological weapons or materials used in so-called dirty bombs.

Police Chief William J. Bratton said a new suitcase-sized device for one of the LAPD's helicopters can detect "radiation signatures" from up to 800 feet above ground. In addition, the LAPD bought six hand-held units that officers on the ground can use.

"Terrorism is all about getting them before they get us," the chief said.

The devices are among several items the city acquired with $3 million in Homeland Security funds that will enable the LAPD to better respond to a terrorist attack or natural disaster, Bratton said.